Additional Pictures 


This TI-40 was manufactured in October 1981 by
Texas Instruments in Abilene, TX (Date code ATA 4581 wk 45 yr 1981.

The printed circuit board (PCB) of this TI-40 manufactured
in October 1981 with the CD4557 calculator circuit.

This TI-40 manufactured a few weeks earlier in Italy
uses the CD4507 calculator chip.

horizontal rule

If you have additions to the above article please email:

Joerg Woerner, October 9, 2002. No reprints without written permission.